The flue pipe is deemed to be sound if
the CO
2
concentration in the combus-
tion air is no higher than 0.2 % or the
O
2
concentration is at least 20.6 %.
If actual CO
2
values are higher or O
2
values are lower, then pressure test
the flue pipe with a static pressure of
200 Pa.
Removing the burner and checking the burner gasket
(replace gasket every two years)
1.
Switch OFF the main power supply
and the ON/OFF switch at the con-
trol unit.
2.
Close the gas shut-off valve and
safeguard against reopening.
3.
Pull electrical cables from fan
motor
A
, gas valve
B
, ionisation
electrode
C
, ignition unit
D
and
earth tab
E
.
4.
Undo the fixing screws of gas con-
nection flange
F
.
5.
Release four nuts
G
and remove
the burner.
!
Please note
Prevent damage to the wire
gauze.
Never rest the burner on the
gauze assembly.
Further details regarding the individual steps
(cont.)
36
Commissioning, inspection, maintenance
5592
883
GB
Summary of Contents for VITODENS 343-F WS4A
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